I have attached a couple of images of Grammoceras sp ammonites, the first is a multi block death assemblance and the second is a single pyritic Grammoceras sp both from the Holderness Coast.

I have a better death assemblance but it's too dark to take an image of it.

The original geological / palaeontilogical place were they are deposited in the Lower Jurrasic of the Yorkshire coast is south of the Peak Fault at Ravenscar but thank's to the last ice age we have some taken from there and deposited on the Holderness Coast.

Nice ammonites. You are very lucky to live in a place which has so many fossils. I got a couple of Yorkshire Coast ammonites for Christmas, although I got much more fossils from places like Morocco, USA and Madigascar- eg dinosaur bones, meteorites, petrefied wood, huge otodus obliquus teeth, angustidens, ect. I'll post some images tommorow.